Tire pump



H.J.BOOSTED TIRE PUMP May 29, 1923; 11,456,711@

Filed Oct. 22. 1920 j We .l

Patented May 29, 1923.

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HENRY'J. BOOSTED, 0F KENOSHA, WISCONSIN.

TIRE PUMP. y

Application filed October 22, 1920. Serial No. 418,641.

useful Improvements in Tire Pumps, of

which the following isa description, reference being had to the accompanying drawings, which are a part of this specification.

This invention relates to certain new and useful improvements in air compressors and refers more particularly to what is commonly termed a tire pump.

The pumps now in common use consist of a cylinder in which a plunger formed of .a cup shaped leather washer works, but this structure is 4faulty as the `air oftentimes leaks by and in a shortspace of time the packing member becomes absolutely useless.

yHence, with this and other inherent objections in mind, my invention has for one of its objects to provide a plunger for a tire pump so constructed that the same will be substantially leak proof whereby the pressure within the tire may be readily obtained.

Another object of this invention is to provide a plunger or piston for a tire pump which is equipped with piston rings in lieu of the leather washer formerly employed, whereby a ositive seal between the plunger and the cylinder walls is obtained.

Another object of this invention is to provide a device of the classl described which may be produced at substantially the same cost as the pumps now in general use.y

With the above and other objects in view which will appear as the description proceeds, my invention residesin ythe novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claim, it being understood that such changes in the precise embodiment of the hereindisclosed invention may be made as come within the scope of the claim.

In the accompanying drawing, I have illustrated one complete example of the physical embodiment of my invention constructed according to the best mode I have so far devised for the practical application of the principles thereof, and in which:

Figure 1 is a view of a tire pump embodying my invention, parts thereof being broken away and in section to more clearly illustrate structural details;

Figure 2 is a view taken through Figure 1 on the line 2 2;

Figure 3 is a view'taken through Figure l on the line 3 3; and

Figure 4 1s a fragmentary sectional view 'taken on the plane of line 4 4 of Figurev 2.

Referring now more particularly to the accompanying drawing, in which like numerals designate like vparts throughout the several views: v l

The numeral 5 designates an elongated cylinder having its lower end closed by a base l6 provided with an outlet 7 communicating with the interior of the cylinder. The outlet 7 has a fieXible tube 8 leading therefrom 'for connecting the same with the'valve stem of the tire to be pumped, not shown, andthe inlet is preferably provided with the usual one way valve tor prevent the air from returning into the cylinder therethrough.

The top of the cylinder 5 is closed by a centrally bored removable cap 9, through the bore of which passes the rod lOhaving a cross handle 11 secured to its outer end and a piston or plunger 12 secured to its inner'A end and mounted to work within the cylinder.

The piston 12 consists of a block or the like 13, of a diameter slightly less than that of the cylinder' 5, having its outer face annularly channeled or recessed, as at 14. Piston rings 15, of any type, being shown in the accompanying drawing as of that type formed from one piece and having the ends thereof normally urged apart, are mounted within the channels 14 to provide a tight but slidable seal with the piston walls. The piston 12 has a central threaded bore 16 with which the lower threaded end 17 of the rod 10 is engaged, the connection between the piston and rod being locked by a nut 18.

With this construction, it will be readily seen that I provide a piston that will have a free sliding movement within the cylinder, and at the same time form a tight seal with the cylinder wall to prevent the leakage of fluid thereby. In order to relieve the operator of shocks due to striking the nut 18 against the cap 9 during the rapid reciprocation of the handle l1, an expansile spring 19 is-coiled about the rod 10 intermediate the cap 9 and nut 18.

In operation, it is essential that no fluid pass the piston on its downward stroke but it is necessary to permit fluid to pass by the complished by providing the piston with a. port or passagewayv "which, is 'normally closed by a leather disc, 0r the like, 21. The disc 21 is of ring shape, surrounding 'the adjacent end of the rod 10, and is secured to .the plunger by a fatniiig' enb'er 22* pesitipneddiametrically opposite the port ablyof resilient metal 23 in Order to give ai@ sam-e may, and a. spam@ or ether ma-,

ient member 24 has one "ent-l` Secr'ed to the n'fnber22 and itfs other fend 'engaging the ring; 2? adjacent the. peri; 2p.

Will be readily appreciated that the disc 21 may'. be of bber, leather erf any' desired inatra-l, andy that the 'cnti'al pe-lings of Athe'discs are of greater diameter` than the rod 10-te permitthe movement thereof to- Ward and away from the port 20. y

What I claim as my invention is:

A tire pump vcomprising acylinder; apistc pryiddvithsplit metallic packing rings workable Within said Cylinder, and

provided Walla pea @mading;i@reggina` emily thqfeehfagh emanati 'acs-ams; apaon-vfnta-11iedise positioned upon the b'ttern *face f Said piton, adapted@ @and yielding metallic die@ pitiaedg baeath Vnlragstinimy whreoi, I ami; signadre;

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